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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2015-2018, Intel Corporation.
* Copyright (c) 2021, IBM Corp.
*/
#include <linux/device.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include "kcs_bmc.h"
/* Implement both the device and client interfaces here */
#include "kcs_bmc_device.h"
#include "kcs_bmc_client.h"
/* Record registered devices and drivers */
static DEFINE_MUTEX(kcs_bmc_lock);
static LIST_HEAD(kcs_bmc_devices);
static LIST_HEAD(kcs_bmc_drivers);
/* Consumer data access */
u8 kcs_bmc_read_data(struct kcs_bmc_device *kcs_bmc)
{
return kcs_bmc->ops->io_inputb(kcs_bmc, kcs_bmc->ioreg.idr);
}
EXPORT_SYMBOL(kcs_bmc_read_data);
void kcs_bmc_write_data(struct kcs_bmc_device *kcs_bmc, u8 data)
{
kcs_bmc->ops->io_outputb(kcs_bmc, kcs_bmc->ioreg.odr, data);
}
EXPORT_SYMBOL(kcs_bmc_write_data);
u8 kcs_bmc_read_status(struct kcs_bmc_device *kcs_bmc)
{
return kcs_bmc->ops->io_inputb(kcs_bmc, kcs_bmc->ioreg.str);
}
EXPORT_SYMBOL(kcs_bmc_read_status);
void kcs_bmc_write_status(struct kcs_bmc_device *kcs_bmc, u8 data)
{
kcs_bmc->ops->io_outputb(kcs_bmc, kcs_bmc->ioreg.str, data);
}
EXPORT_SYMBOL(kcs_bmc_write_status);
void kcs_bmc_update_status(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 val)
{
kcs_bmc->ops->io_updateb(kcs_bmc, kcs_bmc->ioreg.str, mask, val);
}
EXPORT_SYMBOL(kcs_bmc_update_status);
irqreturn_t kcs_bmc_handle_event(struct kcs_bmc_device *kcs_bmc)
{
struct kcs_bmc_client *client;
irqreturn_t rc;
spin_lock(&kcs_bmc->lock);
client = kcs_bmc->client;
if (client) {
rc = client->ops->event(client);
} else {
u8 status;
status = kcs_bmc_read_status(kcs_bmc);
if (status & KCS_BMC_STR_IBF) {
/* Ack the event by reading the data */
kcs_bmc_read_data(kcs_bmc);
rc = IRQ_HANDLED;
} else {
rc = IRQ_NONE;
}
}
spin_unlock(&kcs_bmc->lock);
return rc;
}
EXPORT_SYMBOL(kcs_bmc_handle_event);
int kcs_bmc_enable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client)
{
int rc;
spin_lock_irq(&kcs_bmc->lock);
if (kcs_bmc->client) {
rc = -EBUSY;
} else {
kcs_bmc->client = client;
rc = 0;
}
spin_unlock_irq(&kcs_bmc->lock);
return rc;
}
EXPORT_SYMBOL(kcs_bmc_enable_device);
void kcs_bmc_disable_device(struct kcs_bmc_device *kcs_bmc, struct kcs_bmc_client *client)
{
spin_lock_irq(&kcs_bmc->lock);
if (client == kcs_bmc->client)
kcs_bmc->client = NULL;
spin_unlock_irq(&kcs_bmc->lock);
}
EXPORT_SYMBOL(kcs_bmc_disable_device);
int kcs_bmc_add_device(struct kcs_bmc_device *kcs_bmc)
{
struct kcs_bmc_driver *drv;
int error = 0;
int rc;
spin_lock_init(&kcs_bmc->lock);
kcs_bmc->client = NULL;
mutex_lock(&kcs_bmc_lock);
list_add(&kcs_bmc->entry, &kcs_bmc_devices);
list_for_each_entry(drv, &kcs_bmc_drivers, entry) {
rc = drv->ops->add_device(kcs_bmc);
if (!rc)
continue;
dev_err(kcs_bmc->dev, "Failed to add chardev for KCS channel %d: %d",
kcs_bmc->channel, rc);
error = rc;
}
mutex_unlock(&kcs_bmc_lock);
return error;
}
EXPORT_SYMBOL(kcs_bmc_add_device);
void kcs_bmc_remove_device(struct kcs_bmc_device *kcs_bmc)
{
struct kcs_bmc_driver *drv;
int rc;
mutex_lock(&kcs_bmc_lock);
list_del(&kcs_bmc->entry);
list_for_each_entry(drv, &kcs_bmc_drivers, entry) {
rc = drv->ops->remove_device(kcs_bmc);
if (rc)
dev_err(kcs_bmc->dev, "Failed to remove chardev for KCS channel %d: %d",
kcs_bmc->channel, rc);
}
mutex_unlock(&kcs_bmc_lock);
}
EXPORT_SYMBOL(kcs_bmc_remove_device);
void kcs_bmc_register_driver(struct kcs_bmc_driver *drv)
{
struct kcs_bmc_device *kcs_bmc;
int rc;
mutex_lock(&kcs_bmc_lock);
list_add(&drv->entry, &kcs_bmc_drivers);
list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) {
rc = drv->ops->add_device(kcs_bmc);
if (rc)
dev_err(kcs_bmc->dev, "Failed to add driver for KCS channel %d: %d",
kcs_bmc->channel, rc);
}
mutex_unlock(&kcs_bmc_lock);
}
EXPORT_SYMBOL(kcs_bmc_register_driver);
void kcs_bmc_unregister_driver(struct kcs_bmc_driver *drv)
{
struct kcs_bmc_device *kcs_bmc;
int rc;
mutex_lock(&kcs_bmc_lock);
list_del(&drv->entry);
list_for_each_entry(kcs_bmc, &kcs_bmc_devices, entry) {
rc = drv->ops->remove_device(kcs_bmc);
if (rc)
dev_err(kcs_bmc->dev, "Failed to remove driver for KCS channel %d: %d",
kcs_bmc->channel, rc);
}
mutex_unlock(&kcs_bmc_lock);
}
EXPORT_SYMBOL(kcs_bmc_unregister_driver);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>");
MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
MODULE_DESCRIPTION("KCS BMC to handle the IPMI request from system software");
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